A hypotrochoid is the mathematical term for a path traced by a point attached to a circle rolling around the inside of a another fixed circle. You know it better as the shapes that the classic toy Spirograph makes. We're exploring the art making potential of these shapes with our latest BAM pop-up activity Chalk Hypotrochoids.  

We used our 40w Full Spectrum Laser to cut 1/8" birch plywood. To make your own, download the pattern here.